The Underworld refers, collectively, to the realms of the death gods in Scion.
The various underworlds of the individual pantheons were once connected to one another via the prison of the Titans, creating in fact one Underworld separated into distinct demesnes ruled by each pantheon’s death god. It is to these realms that the shades of the dead who believe in the Gods of the various pantheons are drawn after death. With the escape of the Titans, the nucleus that anchored the pantheons realms together is shattered, the Underworld is fragmented, and many of the souls of the dead have been released to haunt the world of the living.
- Scion: Hero, p. 48